2021BS EN IEC 60444-6:2021 Measurement of quartz crystal unit parameters. Measurement of drive level dependence (DLD)
2013BS EN 60444-6:2013 Measurement of quartz crystal unit parameters. Measurement of drive level dependence (DLD)
BS EN IEC 60444-6:2021 Measurement of quartz crystal unit parameters. Measurement of drive level dependence (DLD) was changed to BS EN 60444-6:2013 Measurement of quartz crystal unit parameters. Measurement of drive level dependence (DLD).